Derrick walking beam



'LS ept. 25,1928.

, 1,685,238 W. R. M DOWELL DERRICK WALKING BEAM Filed July 14, 1926 v v Y X F Z 6 dgwugnlioc M/Z WEjamzZZ mate-a sea. 25, 1228;

UNITED STATES.

1,685,238 BATENT OFFICE.

., B, mnowELL, or LAS vneAs NEvAnA.

' nnrmrcx watxrue BEAM.-

' a plication ined 1111 14,

I The invention relatestogwalking beams for derricks, particularly of the'oil pump type and has ,for its objectto provide a device oi this character comprising a support having an elongated beam connected to the upper end thereof, the ends of which beam are provided with segmentally shaped and concentrically ofwhlch oppositely extending bers connected tol-apump in are d1sposed,'

arranged members in spaced groovesof one flexible memsha ed member and terminates in a weight positioned whereby durm the oscillation of the beam one end of weight may pass inwardly between the adjacent ends of the segmentall shaped members whereby, the

wei ht wi not interfere with the operatlon ofthe device and will act as a counter weight.

A further object is to dispose the periphery of onebf the segmentally shaped members in a position whereby] durmgthe oscillation of the beam the oint of crossing of the flexible members will in the lane of the upwardly and downwardly exten flexible members connected to the pum r0 thereby msurmg an accurateguiding'o the rod in its reciproa side pull thereon.

cation and preventmg1 With the above an other ob ects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing described and claimed, it being understood that changes in the pre-' 'cise embodiment of the invention ma be made within the scope of what is claimed without departing from the spirit of the in-.

I p and are anchored at 22 to ad usting screws yention.

In the drawings 3-? Fi 'e'l is a side elevationof the beam showing the same applied to a pump rod. Figure 2 is a side e evation of the walking beam showingthe double grooves therein. Figure 3 is a top plan view of the walking beam. Y Referring to designates a well casing ha'vmg-a stufling box 2 thereon and a discharge plpe 3. 'Shdably mounted in the stufling ox 2 and extending upwardly therefrom isa pump rod 4wh1ch is reciprocated in the usual manner during a; pumping operation. 7

the drawing, the numeral 1- 1926. Serial No.=122,481.'

, Disposedadjacent the pump rod 4 are spaced supports 5 in bearings in the upper ends of which are rockably mounted the pintles 6 of the walking beam 7. The walking beam 7 1s elongated as clearly shown in Figure 1, and has its ends provided with segmentally shaped members 8 and 9, which i I members are concentrically arranged in relat on to each other, and the ends of the beam 7 are preferably formed integral with the members 8 and 9 intermediate their ends.

Members 8 and 9 are braced in relation to .the beam 7 by the brace arms 10, thereby .formmg a rigid structure. Secured at 11 to the upper end of the segmentally shaped member 7 isa flexible member 12, which flexible member extends over the rounded corner 13 of the upper end of the segmentally shaped member 8, and through the ooves 14 in the outer penphery of the mem er 8, whereby during the rocking of the walking beam 7 said cable v will be at the same distance from the center of the walking beam 7 whereby the weight 15 carried by the lower end of the cable will exert a uniform pull on the beam at all times. Bfytplroviding the space between the lower end 0 e segmentally shaped member 8 and 9, it will be seen that the weight 15 may move into said space during the oscillation of the beam 7, thereby allowing a relatively short flexible member 12 to be used. It will be noted that the lower end of the groove 14 is pro-- vided with a rounded shoulder 16 which will 22 which extend through clamps 23 carried by the piston rod 4, and which clamps may be adjusted upwardly or downwardly for takmfilup any slack which may develop in the ca es 18 and 19. It will be noted that the cables .18 and 19 by extending through the grooves 21 will always be in a plane parallel to the plane of the pump rod 4, and will always be in the same plane, as the segmentally shaped member 9' is moved during the oscillation of the beam 7. Beam 7 may be oscillated in any suitable manner. i

From the above it will be seen that a walking beam is provided which is particularly the stufiing box and insuring a maximum eflicieney of the pump.

The invention having been set forth what is claimed as new and useful 1s v The combination with a pump rod, an osc1llating walking beamadjacent said pump rod,

of segmental members concentrically arranged and carried by the end of said beam, a flexible member anchored to the upper end of one of said segmentally shaped members i-n'a groove in the outer periphery thereof, a weight carried by said flexible member, said weight being positioned whereby upon oscillation of the beam in one direction, one side of said weight will pass between the adjacent ends of the segmental members, the other segmental member having its outer periphery adjacent the pumprod, flexible members conneeted to opposite ends of the last mentioned segmental member, said flexible members ex.

tending through grooves in the periphery of the last mentioned segmental member and anchored to the pump rod at spaced points.

In testimony whereof I hereunto aifix my signature.

' WILLIAM R. MCDOWELL; 

